dropping all databases and starting afresh

Hi,
Just joined the list, and this is first time foray into SQL databases,
so apologies for the (most likely) lame questions.
I have installed 9.4 with PostGIS on Ubuntu 14.10 64bit Desktop.

After install I didn't like where the default databases went to, so I did:

mkdir /mnt/geo_md1/postgres
chown postgres:postgres /mnt/geo_md1/postgres
su postgres
postgres(at)gs01:/home/geograph$ createuser -s -d -e --replication zls
postgres(at)gs01:/home/geograph$ pg_dropcluster –stop 9.4 main
postgres(at)gs01:/home/geograph$ pg_createcluster --start -d
/mnt/geo_md1/postgres 9.4 gisdata

After fiddling for a few days, I now want to start afresh, by deleting
all data and creating a new area in a different directory, but:

neither:

postgres(at)gs01:/etc$ pg_dropcluster –-stop 9.4 gisdata
Usage: /usr/bin/pg_dropcluster [--stop] <version> <cluster>

nor

postgres(at)gs01:/etc$ pg_dropcluster –-stop 9.4 postgres
Usage: /usr/bin/pg_dropcluster [--stop] <version> <cluster>

works.
I've done no createdb commands, so dopdb shouldn't be what I want for
this cleanup (I'd think).

Please can someone spot my oversight.
I'd like to cleanup, change the mount-point for my RAID, and then create
a fresh start.

Thanks in advance,
Zoltan

postgres(at)gs01:/etc$ ls -la /mnt/geo_md1/postgres
total 84
drwx------ 18 postgres postgres 4096 Feb 2 18:07 .
drwxrwxrwx 4 staff staff 4096 Jan 29 18:32 ..
drwx------ 5 postgres postgres 4096 Jan 29 18:34 base
drwx------ 2 postgres postgres 4096 Feb 1 14:13 global
drwx------ 2 postgres postgres 4096 Jan 29 18:34 pg_clog
drwx------ 2 postgres postgres 4096 Jan 29 18:34 pg_dynshmem
drwx------ 4 postgres postgres 4096 Jan 29 18:34 pg_logical
drwx------ 4 postgres postgres 4096 Jan 29 18:34 pg_multixact
drwx------ 2 postgres postgres 4096 Feb 1 14:13 pg_notify
drwx------ 2 postgres postgres 4096 Jan 29 18:34 pg_replslot
drwx------ 2 postgres postgres 4096 Jan 29 18:34 pg_serial
drwx------ 2 postgres postgres 4096 Jan 29 18:34 pg_snapshots
drwx------ 2 postgres postgres 4096 Feb 1 14:24 pg_stat
drwx------ 2 postgres postgres 4096 Jan 29 18:34 pg_stat_tmp
drwx------ 2 postgres postgres 4096 Jan 29 18:34 pg_subtrans
drwx------ 2 postgres postgres 4096 Jan 29 18:34 pg_tblspc
drwx------ 2 postgres postgres 4096 Jan 29 18:34 pg_twophase
-rw------- 1 postgres postgres 4 Jan 29 18:34 PG_VERSION
drwx------ 3 postgres postgres 4096 Jan 29 18:34 pg_xlog
-rw------- 1 postgres postgres 88 Jan 29 18:34 postgresql.auto.conf
-rw------- 1 postgres postgres 129 Feb 1 14:13 postmaster.opts